1. Slide 1 of 25 © Copyright Pearson Prentice Hall > Elements and Compounds Distinguishing Elements and Compounds An element is the __________ _________ of matter that has a unique set of properties. A compound is a _____________ that contains _______ _____ __________ _____________ chemically combined in a fixed proportion. 2.3

2. © Copyright Pearson Prentice Hall Slide 2 of 25 Elements and Compounds > Distinguishing Elements and Compounds Compounds ______ ___ _________ _______ into ________ ____________by __________ __________, but elements cannot. 2.3

3. Slide 3 of 25 © Copyright Pearson Prentice Hall > Elements and Compounds Distinguishing Elements and Compounds Breaking Down Compounds A chemical change is a change that _________ ____________ with a different _____________ than the _____________ matter. When table sugar is heated, it goes through a ___________ of ______________ _____________. 2.3

4. Slide 4 of 25 © Copyright Pearson Prentice Hall Elements and Compounds > Distinguishing Elements and Compounds Properties of Compounds In general, the __________ of _________ are quite _____________ from those of their _________ __________. When the elements sodium and chlorine combine chemically to form sodium chloride, there is a change in composition and a change in properties. 2.3

5. Slide 5 of 25 © Copyright Pearson Prentice Hall > Elements and Compounds Distinguishing Elements and Compounds Chlorine is used to ______ _____________ ____________ in swimming pools. 2.3 Sodium is stored __________ _________ to keep it from reacting with oxygen or water vapor in the air. Sodium vapor produces the light in some street lamps. Sodium Chloride (commonly known as table salt) is used to __________ or preserve __________.

6. © Copyright Pearson Prentice Hall Slide 6 of 25 Elements and Compounds > Distinguishing Substances and Mixtures 2.3 If the composition of a material is ______________, the material is a ______________. If the composition of a material ______ ______________, the material is a ____________.

7. © Copyright Pearson Prentice Hall Slide 7 of 25 Elements and Compounds > Distinguishing Substances and Mixtures This flowchart summarizes the process for classifying matter. 2.3

8. © Copyright Pearson Prentice Hall Slide 8 of 25

9. © Copyright Pearson Prentice Hall Slide 9 of 25 for Conceptual Problem 2.2

10. © Copyright Pearson Prentice Hall Slide 10 of 25 Elements and Compounds > Symbols and Formulas Chemists use chemical symbols to represent elements, and chemical formulas to represent compounds. These chemical symbols were used in earlier centuries. 2.3

11. Slide 11 of 25 © Copyright Pearson Prentice Hall > Elements and Compounds Symbols and Formulas Each element is represented by a one or two- letter chemical symbol. 2.3

12. Slide 12 of 25 © Copyright Pearson Prentice Hall > Elements and Compounds